Finding the Fourth Proportional to 3,964.80, 5,471.76 and 2,196.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,964.80 : 5,471.76 = 2,196.96 : x
2. Step 2: Convert to fraction form
   3,964.80/5,471.76 = 2,196.96/x
3. Step 3: Cross multiply
   3,964.80x = 5,471.76 × 2,196.96
4. Step 4: Simplify right side
   3,964.80x = 12,021,237.85
5. Step 5: Solve for x
   x = 12,021,237.85/3,964.80
6. Step 6: Final answer
   x = 3,031.99